The latest on teresa heinz kerry, the wife of secretary of state john kerry rushed to the hospital late yesterday from the couple's vacation home in nantucket. Abc's martha raddatz joins us with details. All signs are it's a very serious incident. Reporter: It certainly is. She remains in critical condition. Secretary kerry is at her side as he has been since she became ill. It was in the middle of the afternoon yesterday at the end of a long holiday weekend where we have learned this morning that she exhibited seizure-like conditions, although there is no certainty yet on the diagnosis but the family immediately called an ambulance. She was transported to the small hospital on nantucket island. When she arrived it was clear that she needed to be transported to a larger facility. She was flown to massachusetts general hospital in boston. That is where she remains, george. Of course, she's had health problems in the past, fought off breast cancer. Reporter: She did. She is a breast cancer survivor. She is a smart, passionate woman, the definition of a spitfire that cares deeply about global issues. Thank you very much. We wish her the best. Martha put it best, she is a spitfire.

This transcript has been automatically generated and may not be 100% accurate.

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